PROBLEMS BASED ON TIME, DISTANCE AND SPEED
In solving problems based on time, distance and speed we use the following formulae:
Distance = Speed * Time
Time = Distance / Speed
and Speed = Distance / time
Also, if
Speed of a boat in still water = u km/hr
Speed of the current = v km/hr,
then
Speed upstream = (u - v) km/hr
Speed down stream = (u + v) km/hr

Example: Two trains, traveling towards each other, left from two stations that are 820 miles apart,
at 4 pm. If the rate of the first train is 80 mph and the rate of the second train is 84 mph,
at what time will they pass each other?Solution:-After t hours, the two trains will have traveled distances D1 and
D2 (in miles) given by
D1 = 80 t and D2 = 84 t
After t hours total distance D traveled by the two trains is given by D = D1 + D2 = 80 t + 84 t = 164 t
When distance D is equal to 900 miles, the two trains pass each other.
164t = 820
Solve the above equation for t
t = 5 hours.

As many of you know, Winpossible's online courses use a unique teaching method where
an instructor explains the concepts in any given area to you in his/her own voice
and handwriting, just like you see your teacher explain things to you on a blackboard
in your classroom. All our courses include teacher's instruction, practice questions as well as end-of-lesson quizzes for practice. You can
enroll in any of our online courses by clicking here.

The format of Winpossible's online courses is also very suitable for teachers who
are using an interactive whiteboard such as Smartboard on Promethean in their classrooms,
because the course lessons can be easily displayed on such interactive whiteboards.
Volume pricing is available for schools interested in our online courses. For more
information, please contact us at educators@winpossible.com.